Pump



p 1940. F. J. HE'IDEMAN 2,215,700

PUMP

Filed Sept. 2, 1957 2 Sheets-Sheet '1 Snoentor 4 Frederick J Heic/em (Ittom F. J. HEIDEMAN Sept. 24, 1940.

PUMP Filed Sept. 2, 193'! 2 Sheets-Sheet 2 men or fiea erick JHem/eman ,Wl 5 (Ittorneg I Patented Sept. 24, 1940 2,215,700

UNITED STATES PATENT OFFICE PUMP Frederick J Heideman, Detroit, Mich.

Application September 2, 1937, Serial No. 162,169

I 2 Claims. (01. 103-173) This invention relates to pumps, either for which project toward each other from the heads liquid delivery or for compression of air or other 2 and 3. Said driving element comprises a colgases. let I I, fixed on the shaft by a key l2, or equivalent An object of the invention is to provide an means, and a swash pla e rangement formed improved drive for a double-acting, multi-cyliny W Similar, Sp e c a annular ribs l3. def D p, P tting a desired pumping or comthe axis of which intersects that of the shaft pressing capacity to be derived from a considat a divergency t0 fi e 3 Dpr0 imating sixty erably smaller and lighter pump than has heredegree$- ve by t e element H, I3, is a 'set tofore b feagib1e of double-actlng pistons l4, reciprocatory in par- Another object i t provide a drive mecha. allelism with the shaft 6 and equidistant there- 10 nism adapting any desired number of double-actfrom, and u ed around the shaft in an ing pistons to be reciprocated in common by a equiflngular Spaced relation. h p st n s rotary drive element, having a swash plate formed, midway of its length, with an annular on rib l5, substantially conical in itsv axial cross sec- A further'object is t adapt t inlet ports of tion, and all of such ribs I5 engage between the 15 a circular series of pump cylinders to be formed Swish plate ribs p g t e latter to jointly simultaneously by a simple and rapid m reciprocate the pistons. End portions of the pisperaflon tons are slidingly fitted in two annular cylinder Afurther object is to provide an improved valve blocks set snugly into e e d portions of an arrangement to control the cylinder outlet ports the casing member I in a u di g relation 1 a doublmactmgy mu1ti-cy11nder pump to the hubs, and clamped by the heads 2 and 3 These and various other objects are attained agamst Pail of spaced annular O derS by the construction hereinafter described, and interiofly formed on Said memberd b oc s illustrated in the accompanying drawings, whereare formed With bores a o modating the u in: pistons, and fluid inlet ports l9 open from such mg. 1 is a vertical axial sectional View of the bores toward the shaft 6. Said ports of each bummed pump. cylinder block are formed preferably by machin- Fig. 2 is an axial horizontal sectional view mg Such block with an annular groove 20,

thueot ,t tending from the inner peripheral face of the m 3 is a cross n taken upon the line block and cut to a depth to establish the desired 30 H of m area of intersection with the cylinder bores;

Fig. 4 is a view of the inner face of one of Thus the intake ports of each block may be m end buds f the pump casing curateiy and simultaneously formed by a rapid n 5 is a View in elevation f one of two and simple machine operation. The ports l9 8 m plates f r d with discharge ports for are in open communication with a central space they pump cylinders within the pump casing, and the member I is mg. 6 is a fragmentary elevational View formed with an admission opening 2| for the fluid tially in section, showing a modification of the to be pumped Cmnpresseddrive connection from the shaft to the pistons. The exhaust Ports of each cylinder block 40 In these views, the reference character I desig-, are formed efembly m an annular Plate 0 nates the substantially-annular, center member clamped between the heads 2 3 and the of the pump casing, and 2 and 3 a pair of heads member I as to locate such ports at the cylinder closing the ends of said member, and secured axes. Saidplates have their outer faces formed to t latter by bolts 4 the joints being sealed with raised annular lips 24, marginal to the ports 5 by gaskets 5. A shaft 6 journaled in said heads, forming Seats o d v v s e heads axially of the casing projects at one end be- 2 and 3 have sockets 26, individually accommoyond the head 3, for engagement by any suitable dating c valves, and further accommodatin rotary drive means, (not shown) the other end Coiled Springs yieldably Seating e va v of such shaft being centrally recessed to seat a The sockets 26 of each head are interconnected ball I, establishing a thrust bearing against an by an annular groove 28, for ed in the inner fii) adjusting screw 8 centrally carried by the head face f the head o c rry off fl i i h r 2. A locknut 9 on .such screw seats exterlorly from the cylinders, said heads each further havagainst the head 2 to maintain any desired ading a radial groove 29 outwardly extending from justment. Within the casing, the shaft 6 carries the groove 28, and serving to deliver the disa5 a driving element, fitted snugly between hubs l0 charging fluid to opposite ends of a bore 30, ex-

tending through the member I, in parallelism with the shaft, and intersected at its mid portion by an outlet passage 3|, extending to the outer face of the member I. Preferably the casing has an exterior enlargement 3 la to accommodate the passages 29, 30 and 3|.

Any suitable provision is made for preventing leakage of fluid along the shaft 6, as it extends through the head 3. As illustrated, said head is formed, in its outer portion, with a chamber 32 surrounding the shaft and closed by a plate 33 secured to the head by bolts 34, and apertured to accommodate the shaft. A spring 35 is compressed within the chamber 32 between a gasket 36, interiorly engaging the plate 33, and a ring 36a, surrounding the shaft and maintained by said spring in fluid-sealing engagement with an annular flange 31 on the shaft. The sealing ring 36a and gasket 36 are further connected by a corrugated flexible sleeve 38 establishing a fluid seal.

In some installations and particularly the larger ones, it may be preferable to employ a driving element, as shown in Fig. 6, having a single annular rib 39, of a swash plate type, the pistons 40 of the pump being annularly grooved midway of their length, as indicated at El, to accommodate such rib, this being a reversal of the first described construction.

In operation of the described pump, when the shaft 6 is rotatively driven, the swash plate ribs l3 act upon the ribs I of the pistons to reciprocate the latter, each stroke of each piston producing simultaneously a compression in one of the two cylinder blocks and a suction in the other. As each piston completes a stroke, its trailing end uncovers the port IQ of the corresponding bore l8, permitting a rush of fluid into the bore. On the following stroke the "fluid is discharged through the port 22 of said bore, being first compressed, in case the fluid is a gas. The spring 21 corresponding to said bore yields under pressure of the fluid to permit unseating of the valve 25 and escape of the fluid.

The described type of cylinder block permits a considerable number of cylinders to be very compactly grouped, and makes possible accurate machining of all the intake ports in a single operation. The use of a considerable number of cylinders is desirable from the standpoint of efliciency and smooth operation.

Because of its compact size, high relative capacity and lightness, the described pump is suit- ,ed to many installations where ordinary pumps of equal capacity would not be practicable. Among the numerous purposes for which this pump is especially suited may be mentioned aircraft and submarine and other marine installations, Diesel engine fuel delivery, the metered delivery of liquids, and the delivery of oil to machine tools.

It is to be noted that the driving member il, l3 will impose a quite gradual rotation, as well as reciprocation, on the pistons H, thus insuring equal wear of the peripheral face of the pistons, and also distributing wear on the ribs I5, circumferentially thereof.

The invention is presented as including all such modifications and changes as come within the scope of the following claims.

What I claim is:

l. A pump comprising a central casing membar a pair of heads closing the ends of said memher and having hubs projecting toward each other, a pair of cylinder blocks, inserted in the end portions of said central member, and each formed with a plurality oi cylinder bores grouped around the shaft, a plurality of pistons working in bores of both cylinder blocks, a shaft journaled in said heads, and a drive element on the shaft, engaged between said hubs and restrained thereby from endwise movement, and operatively engaging all of the pistons.

2. A pump comprising a central annular casing member, a pair of cylinder blocks snugly fltted into the end portions of the central member and each formed with a plurality of cylinder bores,

a pair of heads closing the ends of the central casing member and retaining said cylinder blocks in place, pistons operating in the bores of both cylinder blocks, the cylinder blocks having central openings therethrough and said heads having hubs extending into such openings, a shaft journaled in such hubs, a drive element on the shaft operatively engaging all of the pistons, and restrained from axial play by said hubs, an annular plate clamped between each head and the adjacent cylinder block and formed with exhaust ports opening from the cylinders in such block, valves recessed in the heads and controlling said exhaust ports, and means yieldably sealing said valves, each head having an annular passage receiving the exhaust of the cylinders of the adjacent block.

FREDERICK J. HEIDEMAN. 

